Andy, the answer is I have yes but it's not as simple a question as that. It's about how the shorty is used too.
In the dry shorty in a RudeBits tray, no extra weight on smooth tracks, 34g under the shorty if bumpy. Car is more agile and direct than with saddles, far nicer to drive.
In the wet saddles would be better due to the weight being slightly further off the centre line and thus creating more roll which helps generate grip. You have to remember the saddles cases are empty at the last 5mm or so of each end so to get the same balance side-side you need to run them with the terminals on opposite sides to each other.
Now having said all that I don't have saddles any more and don't intend to get any more either.
This means in the wet I have to mimic their effect so to do this I use the 23g RudeBits side weights on the RudeBits tray with the weights in the rear position. I also add a 2nd 34g weight under the cells if really slippery. This makes the car feel even better than with saddles as not only is the balance side-side spot on the overall weight is slightly up and the weight bias is slightly more rearward.
I'll normally run the car identical in the wet to the dry other than resetting ride heights +1mm both ends and removing 1-2mm from under the inner ball studs front and rear.
Final point is if you want the absolute best in slippery conditions the lightweight chassis is of benefit I'm told, yet to try one myself but definitely will be getting one soon.
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